Bosch Professional Rotation Laser Level GRL 400 H (One-button keypad, Working Range: up to 400m (diameter), in carrying case)

I’ve done a fair amount of levelling years ago when working on road schemes so have seen quite a bit of the old ways of doing thinks. This device isn’t for that type of levelling but it does certainly overlap in the area of getting ground works level (whereas the levelling I used to do was for digital surveys).

Instructions don’t cover too much and manufacturers should really provide short videos as there really is little to learn. A five minute video would do all that you need.

Please note that this is not a full kit that a builder would use because in order to do that efficiently you need a proper tripod (which Amazon has for about £60 when I looked). That would be an essential edition in my opinion for professional use as would a proper staff too.

Having said that what does this get you for £600? Well you get the rotating level and a remote receiver. If you are not using a tripod, then the main item needs to be on a solid platform where it is not going to get disturbed. As long as that is reasonably level (Bosch claim it will work up to 8 degrees), then the device self-levels when it is turned on. As soon as that is done, the beam is projected and the range is very good.

In addition to this, you get the remote receiver which in most cases would be attached to a staff or other post where a known distance is being used. For example, if you are getting ground level for slabs, you can have pegs driven in, place the remote receiver at a fixed height on a pole resting on the pegs and tap the pegs in when the laser beam triggers the sound on the receiver. You can modify this tactic to measure depths and heights. Basically you are establishing a known datum for the area concerned and working out heights above and below the level of the beam. It’s a lot easier to try than describe.

Clearly inside a building it is easier because you can see the beam on the walls. The same method applies for getting known level differences or, the beam is set at the right height by some means (this is where a proper tripod and staff become very useful) and do it that way.

It comes in a robust carrying case with batteries for everything. For the main unit, it also has a rechargeable pack. The one that came with mine was fully charged which is unusual and I first thought the battery was not working. You’ll need to take care of the charger because the connection for the battery is not like other ones I have for example.

Finally, I had a few issues with 9V batteries testing out the receiver. This is not a fault of the receiver or Bosch who supply a battery for the unit but the ones I had hanging around had charge but not enough for this unit. I got the very loud audible signal as I switched the unit on but then the display went off instantly. It only stayed on with the actual fresh battery supplied. Just something to keep in mind.

Finally it’s worth mentioning that the main laser unit has an impact sensor so that if it gets knocked the beam switches off. This is for you to switch off and on again and let the self levelling take place. You will of course need to take care and do not look directly at the beam no matter what the distance. Most people know this but just make sure those who are in the area while you are working are aware of this as the beam can travel a long way.

Great accuracy for diy and construction

Great product

Great laser for a reasonable price. Everything is tightly secured in the large case so that everything is protected which is good. The laser is easy to use and set up. Good feature having a rechargeable battery pack and a normal battery pack. Gives you options if one runs out.